Contact us with questions, bug reports and tool ideas. Fill in the form below and we will reply by email, usually within a few days.
When to contact us
- Something is broken. A tool shows an error, gives a wrong result or does not load.
- You need a tool we do not have. Tell us the task you are trying to do, and we will consider adding it.
- You have a question. About how a tool works, our Privacy Policy or our Terms of Use.
- Something on the site is wrong. A typo, a broken link or an out-of-date guide.
How to report a bug quickly
A few details help us find and fix a problem much faster:
- The name or link of the tool you were using.
- What you did, and what happened instead of what you expected.
- Your device and browser, for example Chrome on Android or Safari on iPhone. If you are not sure, WhatIsMyBrowser.com shows your browser and version.
- The type and rough size of the file, if a file was involved.
Please do not attach or paste private documents, passwords or personal data. Describe the problem instead, and we will ask for a safe test file if we need one.
Before you contact us
Many questions are already answered on our About page, in the FAQ on each tool page, and in our step-by-step guides. You can also browse the full list of free tools to check whether a tool you need already exists.
Report a security issue
Found a vulnerability, a suspicious file or something that looks like phishing on OneStopOnlineTools.com? Please tell us through the contact form above and start the subject with “Security”. Include the page URL, what you saw and, if possible, the steps to reproduce it. Please do not include passwords or personal data you do not own. We aim to reply within 3 working days, fix confirmed issues as quickly as possible, and will not take action against good-faith research that avoids privacy violations, data destruction and service disruption. Our machine-readable contact file is at /.well-known/security.txt.